Steam-boiler.



W. A. WOODE$ON.

STEAM BOILER. APPLICATION FILED JULY 19,1909.

Patqated June 18, 1912.

2 SEEETS-SHEET 1.

W. A. WOODESON.

STEAM BOILER.

APP IoATIon; rum) YJULY 19,1909.

i fiw ggmg Patented June 18, 1912.

2 SKEET8SHEBT 2.

lf" L aw 51 WILLIAM ARMSTRONG woonnson, or GATESHEAD, ENGLAND.

STEAM-BOiCLER.

' Specification of Letters Patent,

Patented June-1.8, 1912..

Application filed July 19, 1909. Serial No. 508,477.

specification of prior British Letters Patent No. 28383 of 1903 and to steam superheaters suitable for use therewith.

. Figure 1 of the accompanying drawings.

illustrates a battery of two boilers and superheaters embodying this inventionin transverse vertical section. F igl 2 a plan.

Each boiler in the battery under notice, as in the earlier constructions, comprises a furnace a arranged at the front of the boiler, a combustion chamber 6 above the furnace a, three lower water drums d, three corresponding upper steam and water drums 6, straight water tubes f arranged in groups connect-mg said water and steam drums e and water drums d, and a rear flue g, the several drums d and the several drums e be ing'connected by circulating tubes n.

The furnaces a are shown fitted with underfeed stoker apparatus, although other forms of stokers, such as chain grate or other traveling types of stokers can be fitted; and there are no arches over the fire grates.

Instead of a large common steam drum arranged at right angles to the three upper drums e and connected thereto by steel necks, a steam drum 1 is arranged abovle and slightly to one side of the middle steam and Water drum '0 and extendin parallel thereto. The drum 1 is carrie by brackets 2 and is connected to the middle drum e by j v setting 'the' improved boiler can be fitted if tubes 3 so that all bolted joints are obviated and freedom of movement is allowed to the three drums e for expansion and contraction. The groups of tubes f connecting the upper'drums e to the lower drums (Z are not staggered but are arranged in a straight row and the manholes 4- in the drums'e are correspondingly arranged in a straight line, one over each nestoi' tubes. Steam from the upper part of the steam drum 1 flows through a pipe 5 to a superheater arranged in the path of the hot gases flowing tothe flue between two of the drums e and corresponding tubes 7". The tubes 6 in which the superheating takes place are bent to L shape and are attached by expanding or other suitable means to tube'boxes 7, 8, 9

and 10 made offorged steel and arran ed outside the combustion chamber ofthe b0 er. Zlhe' tube boxes 9 and 10 are arranged vertically side by side at one side of the boiler and are placed in free communication with each other by a connecting pipe 1h 12 is a bypass valve connecting the tube box 7 to the tube box 8 and 131s a main outlet valve fitted on the box 8. y p Furthermore, according to this invention in order to provide for expansion and con traction in steam boilers of the type oomprising a lower water drum, an upper steam and water drum, groups or nests of straight A water tubes connecting said drums and extending through the combustion chamber and baflfles arranged transversely length of thedrums and extending alter nately in upward and downward directions and so arranged in relation to the boiler of the" i furnace that the gases flow between thetubes in a sinuous course lengthwise of thecl'rums,

v the lower water drum is suspended the; water tubes from the upper steam and water drum and is otherwise unsupported; the upper drum being carried by the settin 'or case 7 ing of the boiler and in this way all injurious straining of the parts owing to expam sion and contraction is avoided.

The water tubes are arranged in nests located in a straight row or staggered as heretofore proposed in boilers of other type described in the s ecification oi prior British Letters Patent 0s. 28383 of 1903 and 23305 of 1904and over each group of tubesa manhole is provided'in the upper drum thereby enabling the tubes to be easily. examined when desired.

Instead of being arranged in a briQkWQrk desired witha marine type casing in which ca se it can be fixed in its'casing and finished completely with the tubes alreadyeir ended.

in the drums; the whole forming a se i con- ,tained structure capable of being placed in any desired position for use.

The drum 1 is carried by brackets 2 and is connected by numerous short tubes 3 distributed lengthwise thereof to the middle drum only so that all bolted joints are obviated and freedom of movement is allowed to the three drums e for expansion and contraction: the tubes 3 and the drum 1 are external to the boiler casing so that the movement of the drum 1 is simply that due to the ex pansion of'the tubes 7 and the tubes 3 are connected to the middle drum 6 at the same side of the vertical plane containing the axis of the drum as that on which the inclined k scribed can be arranged side by side to form a battery'of boilers as well understood.

What I claim is :i

1. In a steam boiler, Water drums arranged one behind the other, the rear water drum being at a lower level than the front water drum, steam and Water drums corresponding in number to said water drums and located at the top of the boiler, a furnace grate arranged in front of the foremost of said water drums, groups of straight water tubes of dqual length connecting said water'drums tosaid steam and water drums, circulating tubes connectingthe said water drums, circulating tubes connecting the said steam and water drums, a steam drum extending parallel tosaid steam and water drums, and tubes connecting said steam drum to one only of said steam and water drums.

2. In a steam boiler, Water drums arranged one behind the other the rear Water drum being at a lower level than the front water drum, steain and Water drums corresponding in number to said water drums and located at the top of the boiler, a furnace grate arranged in front of the foremost of said water drums, groups of 'straight Water tubes of equal length connecting said water drums to said steam and water drums, circulating tubes connecting the said water drums, circulating tubes connecting the said steam and Water drums, a steam drum extending parallel to said steam and Water drums, and tubes arranged in a row that extends from one end of the said steam drum to the other connecting said steam drum to one only of said steam and water drums.

3. In a. steam boiler, water drums arranged one behind the otherthe rear water drum being at a lower level than the front water drum,steam and water drums corresponding in number to said Water drums and located at the top of the boiler, a furnace grate arranged in front of the foremost of said water drums, groups of straight water tubes of equal length connecting said water drums to said steam and Water drums, the connection of said groups of tubes to one of said steam and water drums being mainly at one side of the central vertical plane of said drum, circulat ing tubes connecting the said water drums, circulating tubes connecting the said steam and water drums, a steam drum extending parallel to said steam and water drums, and steam tubes connecting the said steam and water drum to which the groups of straight water tubes are connected at one side of the central vertical plane to said steam drum; the connection of said steam tubes to said steam and water drum being at the same side of the central vertical plane as that at which the said groups of tubes are connected.

4. Ina steam boiler, water drums arranged one behind the other the rear water drum being at a lower level than the front water drum, steam and Water drums corresponding in number to said water drums and located at the top of the boiler, a furnace grate arranged in front of the foremost of said water drums, inclined groups of straight water tubes of equal length connecting said water drums to said steam and water drums,

the connection of said groups of tubes to 7 one of said steam and water drums being mainly at one side of the central vertical plane of said drum, circulating tubes connecting the said ater drums, circulating tubes connecting the said steam and water drums, a steam drum extending parallel to said steam and water drums, and steam tubes inclined in opposite direction to that of said groups of tubes, connecting the said steam and water drum to which the groups of straight water tubes are connected at one side of the central vertical plane to said steam drum, the connection of said steam tubes to said steam and water drum being at the same side of the central vertical plane as that at which the said groups of tubes are connected. V, Y

Signed at Newcastle-omTyne, England, this sixth day of July 1909. v

I :WILLIAM ARMSTRONG WOODESON 

